36results about How to "Alleviate the current situation of resource shortage" patented technology

The invention belongs to the field of hydrometallurgy and inorganic chemical industry, and particularly relates to a method for extracting manganese from low-grade high-silicon manganese ore containing manganese silicate minerals. The method comprises the technological steps as follows: pretreatment: adding concentrated sulfuric acid to high-silicon manganese ore powder containing 30%-50% of the manganese silicate minerals for aging treatment; leaching: a, adding a pretreated product to water for leaching and separation to obtain a manganese leachate 1 and leached residues; b, adding high-silicon manganese ore to the manganese leached liquid 1, and performing separation to obtain a manganese leached liquid 2 and a solid-phase leached product; treatment of the solid-phase leached product: mixing the solid-phase leached product with concentrated sulfuric acid for aging treatment, and performing separation to obtain a manganese leached liquid 3 and leached residues, and returning the leached liquid 3 to the step b to be used as a leaching agent for leaching high-silicon manganese ore. Under milder conditions, rhodochrosite minerals in the ore can be fully extracted, manganese silicate can be converted into manganese sulfate, the leaching rate of manganese can reach about 90%, and accordingly, the recovery rate of manganese is greatly increased, industrial implementation is easier and the method is environment-friendly.

The invention relates to a method for preparing biological gasoline from biomass, which comprises the following steps: biomass hydrolysis: hydrolyzing biomass in 0.1-10% dilute acid at 140-220 DEG C for 5-240 minutes to prepare levulinic acid; carrying out dehydration reaction on the levulinic acid at 130-180 DEG C for 60-180 minutes under the action of 0.1-5% liquid acid, acidic ionic liquid or molecular sieve to prepare angelica lactone; carrying out polymerization reaction on the angelica lactone at 60-160 DEG C for 1-180 minutes under the action of 0.1-5% inorganic alkali to prepare an angelica lactone polymer; and carrying out hydrogenation reaction on the angelica lactone polymer at 200-400 DEG C for 4-60 hours under the action of a 0.1-5% catalyst to obtain the final product biological gasoline. The method can greatly enhance the carbon utilization ratio, reduce the carbon dioxide emission, and lower the dependence on petroleum and other nonrenewable resources. The method has the advantages of short technical process and mild reaction conditions; and the product has the advantages of high yield and high quality.

The present application discloses a hardenability-preserving gear steel and a preparation method thereof, comprising the following components in mass percentage: C: 0.18-0.21%, Si: 0.20-0.28%, Mn: 0.75-1.05%, Cr: 0.95-1.25 %, Ti:0.035-0.055%, Al:0.020-0.035%, B:0.0008-0.0030%, P≤0.020%, S≤0.010%, T[O]≤20ppm, T[N]≤80ppm, Ni≤0.10 %, Cu≤0.20%, Mo≤0.10%, and the rest is Fe. This application adopts the converter, double refining and continuous casting process, through the control of primary refining and intensive refining, argon blowing at the ladle nozzle, full protection of mold slag process, plasma tundish heating, constant temperature and constant pulling speed casting, and composite electromagnetic stirring to produce narrow castings. Hardened zone, gear steel with excellent fatigue life.